Rotary bit



Dec. 12, 1933. J. L. MONTGMERY ET AL 1,939,131

ROTARY BIT Filed Dec. 22, 1930 Effi. Il'l 4 mvg/v TORS. 1

Patented Dec. 12, n 1933 PATENT OFFICE ROTARY BIT James L. Montgomery,Arthur J. Tarbell, and Emmett H. Irwin, I .ong Beach, Calif.

Application December 22, 1930 Serial No. 503,864

4 Claims. (Cl. Z55-71) This invention relates to a rotary bitparticularly applicable for the drilling of oil wells, and the primeobject is to provide a bit of the disc type in which both of the discsare so interconnected that they rotate in unison.

Another object is to provide a bit of the character stated in whichneither of the discs can wear flat due to constant wear in one position.

Still another object is to provide a bit which is self-cleaning, andwhich will not become choked and clogged with material and cuttingswhile in the hole.

Other objects, advantages, and features of invention may appear from theaccompanying' drawing, the subjoined detailed description, and theappended claims.

In the drawing Figure 1 is a side elevation of our bit.

Figure 2 is a face View of one of the discs.

Figure 3 is a face view of aplane disc which may be used in our bit.

Figure 4 is a bottom plan view of our bit.

Referring more particularly to the drawing, the numeral 1 indicates theshank of our bit which is secured to the bottom of the drill pipe in theusual manner. That is, by screwing the drill pipe on to the threaded pin2. A pair of ,arms 3-4 depend from the bottom of the shank l and a disc5 is mounted on each of the arms. The discs are journaled upon pinswhich extend through the arms, all of which is usual and wellknown inthe art.

A water course 6 extends axially through the shank l, and this course isbifurcated at the bottom so that a stream of liquid is directed againsteach of the discs 5, thereby effectively cleaning the discs and washingall cuttings and dbris therefrom.

The discs 5 may be formed with a plurality of teeth or fingers '7thereonyas shown in Figure 2, or the disc may be plain as shown inFigure 3. In order that the two discs 5 should rotate in unison as thebit is rotatedvin the bottom of the hole, we provide a plurality ofinwardly extending teeth or lugs 8 on each of the discs.

These lugs mesh when the discs are in position on the shank, andconsequently will cause the other disc to also'rotate. The lugs 8 areformed on the inner face of each of the discs and may be either integralwith the disc, or may be formed upon a separate ring which is suitablysecured to the disc.

Having described our invention, we claim:

1. A rotary bit comprising a shank, discs rotatably mounted on the shankon axes disposed on opposite sides of the longitudinal axis of the bitand offset forwardly thereof in the direction of rotation of the bit,teeth extending from said discs, said teeth intermeshing whereby thediscs are rotated in unison.

2. A rotary bit comprising a shank, a pair of arms depending from theshank, a disc rotatably mounted on each of the arms on axes disposed onopposite sides of the longitudinal axis of the bit and offset forwardlythereof in the direction of rotation of the bit, teeth extendinginwardly from each of the discs, said teeth intermeshing K whereby thediscs are rotated in unison.

` 3. A rotary bit comprising a shank, a pair of arms depending from theshank, a disc rotatably mounted on each of the arms on axes disposed onopposite sides of the longitudinal axis of the bit and offset forwardlythereof in the direction of rotation of the bit, teeth extendinginwardly from each of the discs, said teeth intermeshing whereby thediscs are rotated in unison, a plurality of radially extending fingersformed on each of thediscs, said fingers engaging the ground topositively rotate said discs.

4. A rotary bit comprising a shank, a pair of arms on the shank, a disccutter rotatably mounted on each of the arms on axes disposed onopposite sides of the longitudinal axis of the bit and offset forwardlythereof in the direction of rotation of the bit, engaging means on eachof the discs, the engaging means on each of the discs intermeshingwhereby the discs are rotated in unison.

JAMES L. MONTGOMERY. ARTHUR J. TARBELL. EMMETT H. IRWIN.

